1RC2

2.5 Angstrom Resolution X-ray Structure of Aquaporin Z


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Architecture and selectivity in aquaporins: 2.5 a X-ray structure of aquaporin Z

Savage, D.F.Egea, P.F.Robles-Colmenares, Y.O'Connell III, J.D.Stroud, R.M.

(2003) PLoS Biol 1: 334-340

  • DOI: https://doi.org/10.1371/journal.pbio.0000072
  • Primary Citation of Related Structures:  
    1RC2

  • PubMed Abstract: 

    Aquaporins are a family of water and small molecule channels found in organisms ranging from bacteria to animals. One of these channels, the E. coli protein aquaporin Z (AqpZ), has been shown to selectively conduct only water at high rates. We have expressed, purified, crystallized, and solved the X-ray structure of AqpZ. The 2.5 A resolution structure of AqpZ suggests aquaporin selectivity results both from a steric mechanism due to pore size and from specific amino acid substitutions that regulate the preference for a hydrophobic or hydrophilic substrate. This structure provides direct evidence on the molecular mechanisms of specificity between water and glycerol in this family of channels from a single species. It is to our knowledge the first atomic resolution structure of a recombinant aquaporin and so provides a platform for combined genetic, mutational, functional, and structural determinations of the mechanisms of aquaporins and, more generally, the assembly of multimeric membrane proteins.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California School of Medicine, San Francisco, California, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aquaporin ZA [auth B],
B [auth A]
231Escherichia coliMutation(s): 0 
Gene Names: AQPZBNIPB0875C1009SF0832S0873
Membrane Entity: Yes 
UniProt
Find proteins for P60844 (Escherichia coli (strain K12))
Explore P60844 
Go to UniProtKB:  P60844
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60844
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 
  • Space Group: P 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.55α = 90
b = 93.55β = 90
c = 80.38γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Refinement description, Structure summary